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30 Nov 2008, 07:18
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Hi, everybody!
the q looks easy, but i can not come to the OA stated in the test. Hope, you gonna be more lucky
How many seconds will it take for a car that is traveling at a constant rate of 45 miles per hour to travel a distance of 22 yards? (1 mile = 1,160 yards)
A. 8
B. 9
C. 10
D. 11
E. 12
the q looks easy, but i can not come to the OA stated in the test. Hope, you gonna be more lucky
How many seconds will it take for a car that is traveling at a constant rate of 45 miles per hour to travel a distance of 22 yards? (1 mile = 1,160 yards)
A. 8
B. 9
C. 10
D. 11
E. 12
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Updated on: 30 Nov 2008, 11:56
Originally posted by jallenmorris on 30 Nov 2008, 07:59.
Last edited by jallenmorris on 30 Nov 2008, 11:56, edited 1 time in total.
Last edited by jallenmorris on 30 Nov 2008, 11:56, edited 1 time in total.
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Yes, this question is not correct. For those that are not used to using anything but meters, the 1 mil = 1160 yards is not correct. 1 mile = 5280 feet. 1 yard = 3 feet. 5280 / 3 = 1760 yards per mile, not 1160.
At 45 miles per hour, the car will go 45 miles in 1 hour (yeah, i know that's obvious...but still).
to go 1 mile, this is 1/45 of the distance in an hour and 1/45 of the time. so 1/45 * 60 = number of minutes to go that 1 mile.
60 / 45 = \(1\frac{1}{3}\) minutes, or 1 min. 20 seconds to go 1 mile. (1 min 20 seconds = 80 seconds)
r * t = distance
r = 80 seconds per mile Since the question asks for seconds, lets turn this into seconds.
t = unknown
distance = 22 yards
Now set up the simple comparison equation:
\(\frac{22}{1760} = \frac{x}{80}\)
To eliminate the fractions, cross multiple (22 * 80) and (1760 * x)
1760x = 1760
x = 1
At 45 miles per hour, the car will go 45 miles in 1 hour (yeah, i know that's obvious...but still).
to go 1 mile, this is 1/45 of the distance in an hour and 1/45 of the time. so 1/45 * 60 = number of minutes to go that 1 mile.
60 / 45 = \(1\frac{1}{3}\) minutes, or 1 min. 20 seconds to go 1 mile. (1 min 20 seconds = 80 seconds)
r * t = distance
r = 80 seconds per mile Since the question asks for seconds, lets turn this into seconds.
t = unknown
distance = 22 yards
Now set up the simple comparison equation:
\(\frac{22}{1760} = \frac{x}{80}\)
To eliminate the fractions, cross multiple (22 * 80) and (1760 * x)
1760x = 1760
x = 1
Rice
